OpenGL error (1282) is really annoying

[texus]

The ugly text rendering will need to be investigated further. It looks like bad anti-aliasing.
Edit: maybe the framebuffer needs a multisample attachment, such as described in the "Off-screen MSAA" section on https://learnopengl.com/Advanced-OpenGL/Anti-Aliasing

Try disabling GL_CULL_FACE before rendering TGUI, having that enabled also seems to remove the text. I see your code enabling it right after the shadow manager, so maybe that is the problem instead of the shadow manager itself (which I haven't tested here yet).

[kuso4ek]

Wow, disabling GL_CULL_FACE actually helped. I also drawing it without a framebuffer, so text is pretty and anti-aliased. Thanks!